SCUBA2: update POD to document recipe outcome more clearly
SCUBA2: return calibrated files to the current object

In the pipeline, the calibrated data files are uncropped, and it is
these files that should be stored as reduced products, so they can be
used for science, rather than the cropped files.

In PICARD, the user is supplying their own science data which may
already be calibrated - any files calibrated by the recipe are usually
deleted.